Balanced Homodyne Detector With Independent Phase Control and Noise Detection Branches

Abstract

Squeezed state light is a fundamental resource for many quantum optics experiments. Important applications like quantum-enhanced magnetometer and quantum key distribution, require the squeezing level as high as possible. In balanced homodyne detection, the detector output is directly proportional to the noise of the squeezed beam. The detected quadrature is dependent on the relative phase between the squeezed beam and local oscillator. Here, we present a balanced homodyne detector (BHD) with independent phase control and noise detection branches. The independence between the phase control and noise detection branches is experimentally verified, the two branches are independently optimized according to the practical requirements. With the BHD, a bright squeezed light at 1550 nm with quantum noise reduction of 10.3 dB is directly detected. After stabilizing the relative phase between the squeezed states and local oscillator by the phase locking branch of the BHD, the fluctuation of the noise suppression is ±0.2 dB by 1-h testing time.

A Novel Modulation Scheme for Homodyne Detection Control

“…This is a powerful technique used in quantum optics to analyze field quadratures and reconstruct quantum states of light [1,2]. In particular it is deployed in the measurement of gravitational waves, characterizing entanglement-based quantum key distribution systems, and other several other quantum information tasks [3][4][5][6] However, optical homodyne detection requires precise control of the relative phase between the signal and LO -i.e. the "homodyne angle" -that determines the detected quadrature.…”